Malicious PDF — malware analysis report

Static analysis result for SHA-256 67803be0735215e3…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 04:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aee5dba0fd108055dcd8f51d76c49819 SHA-1: c246cbedb13f4621d9eb718d2e5d985d4c5110f9 SHA-256: 67803be0735215e385c6cf1b48ec58538a307c2b956e3f098f2a468266d79813
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=pokemon+card+game+gba+rom PDF link annotation
    • http://devitohomesorlando.com/userfiles/files/guzabivusanebenanejegixer.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0c73fa2b8ab9431611180fe9c4455e90/vutiserujejawusegemogurak.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/41526422880.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/37049529636.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/dipiviniworetevomitoxor.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/wezilevivabetofaferupa.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/66008259840.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/jagodejogujumiz.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/63979493863.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/vewupolezekexobabomajelor.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/negoso.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/vabavadizelajapigiwizuti.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/62533082835.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/kafekawunutumatavopiji.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/lixaba.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/94085402887.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/46673484323.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/38262812307.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/23641847757.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361c974bbf3---rewezijulavibasexowag.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/34623109513.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/ditagexerujuxib.pdfIn PDF document text
    • http://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/82592118563.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 17944 bytes
SHA-256: 3a545f6d88db6e3f2c38c8ad5077d95a838a354b7808b1febb544c2928fadedd
font_02_sfnt_off00013743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 10544 bytes
SHA-256: 2a2de68b0176c81e01152dc11d66fbb657da2d97ff228d90b94b965a7e74905f

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